Heat-distributer for cooking utensils.



A. B GRUIGKSHANK. HEAT DISTRIBUTER- FOE COOKING UTBNSILS APPLICATIONFILED JUNE 1a, 1913.

1,109,323, Patented Sept 1,1914.

2 S HEETSSHEET 1.

WITNESSES A. B. GRUIUKSHANK HEAT DISTRIBUTER. FOR COOKING UTENSILS.

APPLICATION FILED JUNE 18, 1913.

1,109,323 V Patented Sept. 1, 1914.

@ 195 wmmmmm i To all whom it may STATES rngaisrr OFFICE;

.llIWIH'U'R B. CRUICKSHANK, OF LONDON, ENGLAND.

Specification of Letters Patent.

Patented Sept. 1, 1919:.

Application filed June 18. 1918. Serial No. 774,319.

concern:

I, ARTHUR B. Camou- SIIANK, a subject of the King of Great- Britain,residing at London, England, have invented an ImprovementinHeat-Distributers for Cooking Utensils, of which the following is aspecification.

My present invention relates to 21 Be it known that.

heat

' distributer for cooking utensils and is adapted to efi'ectan evendistribution of heat from the gas flam'eover the under surface of acooking utensil. i

The device of my present invention is what may be termed a single plateheat distributer, in contra-distinction to heat distributors in which aplurality of'plates are employed. Such a single plate heat distributeris shown and described in Letters Patent No. 928,63 l, granted to me onthe 20th day of July, 1909, and while the device disclosed in thispatent adequately answers the purposes for which it .was intended, nospecial provision was made in it for retain ing the heat, andconsequently its use on tailed an otherwise unnecessary consumption ofgas.

The object of my present invention is therefore the provision of asingle heat distributer which is so constructed as to evenly distributethe heat over the bottom of a coo-king vessel and also to retain theheat so as to reduce the gas consumption to a minimum. i

Incarrying out my present invention, the heat distributer made inaccordance therewith preferably comprises a single piece of sheet metalhaving a concave outer face and being provided with :1 depending rimupon the edge of which the distributer rests when in use. Thedistributorv may obviously be provided with concentric ribs orcorrugations for stifiiening and strengthening the same and may also beprovided with series (if varied sized and spaced apertures for assistingin the distribution of the heat, as

will be hereinafter more particularly described.

In the drawing, Figure 1 is a plan of my improved heat distributor, Fig.2 is a cross section on line .70 m, Fig. 1, Figs. 3 and 4, Figs. 5 and6, Figs. 7 and 8, and Figs. 9 and 10 are, respectively, plans andcentral cross sections illustrating modified forms of the invention.

As will be seen by reference to the drawings, and particularly Fig. 1,my improved heat distributer is made from a single piece of sheet metalwhich is indicated upper or outer face of the distributer is preferablyconcave, as indicated at '11, and at its periphery there is a dependingflange or rim 13, the edge of which is preferably turned or rolled asindicated at 14, providing a surface upon which the device rests when inuse. At the center, the'heat' distributer plate in this form is providedwith a flat portion indicated at 12, although this may be curved as inFigs. 3 and d, and between this portion 12 and the flange I prefer toprovide a series of ribs or corrugations 15 for the purpose ofstrengthenin or stifiening the plate. As indicated in the drawing theseribs or corrugations are circular and concentric, and may be spacedapart as desired.

In the annular portions 17 of the heat distributer plate, that is thoseportions between the circular ribs or corrugations, I

prefer to employ series of apertures indicated at 16. These aperturespreferably increase in diameter from the center toward the outer portionof the plate, and furthermoreare more closely spaced as the distancefrom the center increases. That is to say, the

apertures nearer the center of the plate are smaller than those nearerthe outer portion of the plate, and the circular series of apertures inthe innermost annular portion are spaced considerably farther apart thanare those in the outermost annular portion.

It will be apparent from the foregoing that the tendency of the inner orunder con- ;vex surfaces of the plate is to. throw the heat from the gasburner toward the periphery of the plate," and that the depending flangetends to retain and distribute the heat evenly at 10. The

over this convex under surface. it will also be apparent that as thesize and number of the apertures increase from the center outward thatthe greater amount of heat will be permitted to pass through the plateand be directed against the under surface of the cooking vessel as thedistance from the center of the plate increasesl It will furthermore beapparent that inasmuch as the upper or outer surface of the heatdistributer plate is concave, there will be an air chamber between theunder side of the cookin vessel and that portion of the heat distri uterplate immediately ibeneath the same, irrespective of the size of thecooking-Ivessel employed, and this air chamber a, ords a further meansfor retaining the heat and evenly distributing the same against theunder surface of the cooking vessel. I may also employ a ring 18,suitably secured to the rim 13 and by which the distributor may behandled when in use and supported when not in use. a

Referring to Figs. 3 and 4, it Wlll be seen that the plate 19 may besquare and pro' vided with a central concave portion indicated at 20.This concave portion is pro vided with apertures 21,, arranged incircular series and varying in sizes, the spaces between the aperturesin each circular series trally with a well or depressed portion,indicat-ed at 24, this depressed portion being provided with apertures25, which are arranged insquare series, increasing in diameter from thecentral series outwardly. The plate in this form of the invention isalso rovided With a rim 26, similarly to those OI'IDS of the inventionhereinbefore described.

Referring to Figs. 7 and 8, the plate 27 may be circular in outline,provided centrally with a well 28, provided with apertures 29, thoseportions of the plate extending between the well 28 and the rim 30 beingconcave, as is plainly indicated in Fig. 8, and the concave portions ofthe plate may be provided with apertures 31. Both the apertures 29 andthe apertures3l are arrang'edin circular series and increase in diameteras the distance from the center increases, and are spaced more closelyin the outer than in the inner series.

Referring to Figs. 9 and 10, the plate 32 may be square in outline andprovided with a central circular well or depression 33', in.

which there are apertures 34 increasing in diameter as in the otherforms of the invention, from the center of the Well outwardly and alsobein more closely spaced in the outer than in t e inner series.

I claim as my invention:

1. A heat distributor comprising a concavo convex plate of sheet metalrovided with series ofconcentric corrugations and intermediate annularportions, the said annular portions being provided with series ofapertures, the. said apertures in the inner series being spaced atgreater distances than the apertures in the outer series;

the apertures in the central series thereof being smaller and spaced atgreater distances apart than the apertures in the outer series thereof,and a rim connected to and depending from the said plate.

4. A heat distributer comprising a concavo convex plate of sheet metalrovided with series of concentric corrugations and intermediate annularportions, the said an nular portions being provided with series ofapertures, the apertures in the innermost annular portion being smallerand spaced at greater distances than the apertures in the outermostannular portion, and a depending rim connected with the said plate.

5. A heat distributer comprising a concavo convex plate of sheet metal,provided with series of spaced concentric corru ations and intermediateannular portions, t e said annular portions being provided with a seriesof apertures, the apertures of the said series thereof graduallyincreasing in diameter from the innermost to the outermost series withthe distance between the series of the said apertures graduallydecreasing from the innermost to the outermost series thereof.

6. A heat distributor comprising a plate of sheet metal, and a dependingperipheral flange, the said plate having a concavo convex portionprovided with series of perforations which are spaced closer to oneanother in the outer part of the plate than vin the inner part thereof.

7. A'heat distributer comprising a late of sheet metal and a dependingperip ieral flange, the said plate having a concave convex portionprovided with series ofperforations, the diameters of which are largerin the outer part of the plate than in the inner part thereof.

8. A heat distributor comprising-a late 115 of sheet metal and adepending perip eral flange, the said plate being provided centrallywith a well or depression, and also with a series of perforations whichare more closely spaced and of larger diameter in the outer part of theplate than in the inner part thereof.

Signed by me this 4th day of J line, 1913.

ARTHUR B. CRUICKSHANK. lVitnesses: v

H. D. JANESON, O. J. WonrI-I.-

